lib: utils: serial: Initial commit of xlnx-uartlite

Initial commit of the xlnx-uartlite device and FDT support. This was
tested by running OpenSBI on a modified QEMU virt machine using the
xlnx-uartlite for serial.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Xiang W <wxjstz@126.com>
Reviewed-by: Anup Patel <anup@brainfault.org>

lib/utils/serial/fdt_serial_xlnx_uartlite.c

@@ -0,0 +1,35 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2022 Western Digital Corporation or its affiliates.
+ *
+ * Authors:
+ *   Alistair Francis <alistair.francis@wdc.com>
+ */
+
+#include <sbi_utils/fdt/fdt_helper.h>
+#include <sbi_utils/serial/fdt_serial.h>
+#include <sbi_utils/serial/xlnx_uartlite.h>
+
+static int serial_xlnx_uartlite_init(void *fdt, int nodeoff,
+				const struct fdt_match *match)
+{
+	int rc;
+	struct platform_uart_data uart;
+
+	rc = fdt_parse_xlnx_uartlite_node(fdt, nodeoff, &uart);
+	if (rc)
+		return rc;
+
+	return xlnx_uartlite_init(uart.addr);
+}
+
+static const struct fdt_match serial_xlnx_uartlite_match[] = {
+	{ .compatible = "xlnx,xps-uartlite-1.00.a" },
+	{ },
+};
+
+struct fdt_serial fdt_serial_xlnx_uartlite = {
+	.match_table = serial_xlnx_uartlite_match,
+	.init = serial_xlnx_uartlite_init,
+};